期刊
NEOTROPICAL ICHTHYOLOGY
卷 13, 期 3, 页码 547-555出版社
SOC BRASILEIRA ICTIOLOGIA
DOI: 10.1590/1982-0224-20150015
关键词
D-loop; River disruption; STR; Tabarana
类别
资金
- Virginia Agricultural Experiment Station
- Hatch Program of the National Institute of Food and Agriculture, U.S. Department of Agriculture
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [2007/50094-0]
Genetic variation of Salminus hilarii was assessed by screening microsatellite loci and mitochondrial D-loop DNA across four sampling in the upper rio Parana basin of Brazil. Genetic diversity - measured as mean expected heterozygosity (0.904) and mean number of alleles across populations (13.7) - was reasonably high. Differentiation of microsatellite allele frequencies among populations was shown to be low but significant by AMOVA Phi(ST) (0.0192), and high by D-EST (0.185). D-loop variation was high, with haplotypic diversity of 0.950 and nucleotide diversity of 0.011. Mitochondrial DNA-based estimates for population differentiation were high, with an overall Phi(ST) of 0.173. The results of tests of nuclear and mitochondrial variation yielded no unequivocal inference of historical demographic bottleneck or expansion. Genetic differentiation observed among S. hilarii populations in the rio Grande may be caused by a combination of historical differentiation and recent gene-flow disruption caused by the dams followed by reproduction of isolated spawning assemblages in mid-sized tributaries of the respective reservoirs. We present spatially more intensive sampling of S. hilarii populations across the rio Parana basin in order to more effectively distinguish between historical and contemporary differentiation.
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